Set a Fixed div to 100% width of the parent container

Question

I have a wrapper with some padding, I then have a floating relative div with a percentage width (40%).

Inside the floating relative div I have a fixed div which I w

Answer 1

How about this?

$( document ).ready(function() {
    $('#fixed').width($('#wrap').width());
});

By using jquery you can set any kind of width :)

EDIT: As stated by dream in the comments, using JQuery just for this effect is pointless and even counter productive. I made this example for people who use JQuery for other stuff on their pages and consider using it for this part also. I apologize for any inconvenience my answer caused.